Method for instructing CSI feedback signaling configuration and base station

ABSTRACT

A method for instructing CSI feedback signaling configuration and base station are provided, the method comprising: a base station side notifies a terminal side, via the first higher layer signaling of a UE-Specific, a CSI-RS resource for measuring CSI, the CSI-RS resource comprising at least one of: the time frequency position of the CSI-RS resource in a subframe, the antenna port number configuration of the CSI-RS resource, a period and a subframe offset of the CSI-RS resource, the sequence identifier of the CSI-RS resource, and the power control information of the CSI-RS resource; the base station side instructs the terminal side to feed back the CSI corresponding to the CSI-RS resource. In the present invention, the base station side flexibly configures the terminal side to feed back various kinds of CSI information, thus enabling the base station side to flexibly and dynamically acquire the CSI, and in turn realizing precise link self-adaption and data transmission, and reducing the uplink feedback overhead and measurement complexity of the terminal side.

CROSS-REFERENCE TO RELATED APPLICATIONS/INCORPORATION BY REFERENCE

This application is a continuation of U.S. patent application Ser. No.15/688,333, filed Aug. 28, 2017, and entitled “METHOD FOR INSTRUCTINGCSI FEEDBACK SIGNALING CONFIGURATION AND BASE STATION,” which is acontinuation of issued U.S. Pat. No. 9,749,991 issued on Aug. 29, 2017,U.S. patent application Ser. No. 14/400,029, filed Nov. 10, 2014, andentitled “METHOD FOR INSTRUCTING CSI FEEDBACK SIGNALING CONFIGURATIONAND BASE STATION,” which is a 371 of International Patent ApplicationNo. PCT/CN2013/074793, filed Apr. 26, 2013, entitled “CSI FEEDBACKSIGNALING INSTRUCTION CONFIGURATION METHOD AND BASE STATION,” whichclaims priority to Chinese Patent Application No. 201210144327.7, filedMay 10, 2012. The above-identified applications are hereby incorporatedherein by reference in their entirety.

TECHNICAL FIELD

The disclosure relates to the field of communications, and in particularto a method for instructing CSI feedback signaling configuration andbase station.

BACKGROUND

The long term evolution (LTE for short) system has experienced severalversions of R8/9/10, and R11 technique is researched successively andaccurately. Currently, some R8 products start to be commercially usedgradually, while R9 and R10 are waiting for further product planning.

After experiencing R8 and R9 periods, a number of new characteristicsare further added to R10 on the basis of the former two, such as pilotfrequency characteristics of DMRS (demodulation reference signal) andCSI-RS (channel state information reference signal), transmission andfeedback characteristics of 8-antenna support, and especially, the eICIC(enhanced inter-cell interference cancelling) technique furtherconsiders the inter-cell interference avoiding technique on the basis ofconsidering R8/9 ICIC. The technique for solving the inter-cellinterference problem mainly considers cell interference avoiding in ahomogeneous network in the early R10 period, and the eICIC technique andCoMP (coordinated multi-point) technique are main streams. As the nameimplies, CoMP is that multiple nodes coordinate with one node ormultiple UEs send data over the same time frequency resource ordifferent time frequency resources. Such a technique may reduceinter-cell interference, improve the throughput rate of cell edges, andenlarge the coverage of cells. However, in late discussion, since theheterogeneous network is taken into consideration and more scenarios areintroduced, and due to the complexity of the CoMP technique and the timelimit of R10 discussion, it is finally decided not to introduceadditional CoMP standardized contents in the R10 period; however, when aCSI-RS is designed, it may be designed considering some requirements ofthe CoMP. Thus, the CoMP technique is not further discussed after the 60bis conference.

In LTE a PDCCH (physical downlink control channel) bears schedulingallocation and other control information are defined. Each PDCCH isformed by several CCEs (control channel elements), and the number ofCCEs of each subframe is determined by the number of PDCCHs and downlinkbandwidth.

UE obtains the PDCCH by performing blind detection in a search space.The search space is divided into a common search space and a UE-specificsearch space. The common search space refers to a region where all theUEs may search, and this space carries cell-specific information. Thespecific search space refers to a space range where a single UE maysearch, and specific search spaces of multiple UEs may be overlapped,but generally only the initial search positions are different. Beforethe blind detection, higher layer signaling notifies the UE a workpattern and a radio network temporary identity (RNTI for short) typeused for PDCCH cyclic redundancy check (CRC for short) scrambling.

Please see table 1 for the relationships among the search space S_(k)^((L)) and an aggregation level L and the number M^((L)) of candidatePDCCHs. The aggregation level is the number of CCEs occupied by thePDCCHs. When blind detection is performed in a UE-specific search space,a user equipment first calculates an initial blind detection positionY_(k) according to UE identification (UE ID), a subframe number, etc.,then performs detection in the search space, until a PDCCH allocated tothe user equipment is detected.

TABLE 1 PDCCH candidate set Number of Search space S_(k) ^((L))candidate Aggregation level Size [number of PDCCHs Type L CCEs] M^((L))UE specific 1 6 6 2 12 6 4 8 2 8 16 2 Common 4 16 4 8 16 2

Please see table 2 for the corresponding relationship between therelative positions of the aggregation level and the first controlchannel element of the PDCCH in the UE-specific search space. Therelative position of the first control channel element of the PDCCH inthe UE-specific search space refers to the relative position of a firstCCE index nCCE occupied by the PDCCH with respect to the initial blinddetection position Y_(k), and nCCE,offset are used for representation inthis text. nCCE,offset=nCCE−Y_(k), and the value range of nCCE,offset is0-6, 8, 10. As shown in table 2, it is a schematic diagram of a possiblefirst CCE position and an aggregation level corresponding thereto in theUE-specific search space.

TABLE 2 Corresponding relationship between aggregation level and firstCCE position Relative position of the first CCE Aggregation level in theUE-specific search space L = 1 nCCE, offset = 0/1/2/3/4/5 L = 2 nCCE,offset = 0/2/4/6/8/10 L = 3 nCCE, offset = 0/4 L = 4 nCCE, offset = 0/8

In the latest 68 bis conference discussion process, feedback andinterference definition assumptions are discussed in detail. Currently,the main view is to respectively conduct researches on channelmeasurement and interference measurement and channel measurement andinterference are configured independently, and aggregation feedback ofdifferent CSI-RS resources may be supported, wherein the aggregationfeedback comprises aggregation PMI feedback and aggregation CQIfeedback. In addition, the overhead of feedback and that downlinkcontrol signaling and the size of a CoMP measurement set is relevant areconsidered; therefore, it is necessary to firstly discuss and limit thesize of the CoMP measurement set, such that the feedback and downlinkcontrol signaling may acquire further discussion convergence. Accordingto the 68 bis conference and offline discussion, it is primarily definedthat the size of the CoMP measurement set is not greater than 2 or 3 atmaximum, such that appropriate convergence may be performed on furtherfeedback and control signaling researches.

With regard to the problem of how to configure the terminal side to feedback CSI required by the base station side in the related art, there isstill no effective solution proposed currently.

SUMMARY

The present invention provides a feedback signaling instructionconfiguration method and base station to at least solve the problem ofhow to configure the terminal side to feed back CSI required by the basestation side mentioned above. The CSI of different aggregation modesand/or interference assumptions of CSI-RS resources may be multiplepieces of CSI in one carrier and may also be multiple pieces of CSI inmultiple carriers.

According to one aspect of the present invention, a method forinstructing CSI feedback signaling configuration is provided,comprising: a base station side notifies a terminal side, via the firsthigher layer signaling of a UE-Specific, a CSI-RS resource for measuringCSI, the CSI-RS resource comprising at least one of: the time frequencyposition of the CSI-RS resource in a subframe, the antenna port numberconfiguration of the CSI-RS resource, the period of the CSI-RS resourceand subframe offset, the sequence identifier of the CSI-RS resource, andthe power control information of the CSI-RS resource; the base stationside instructs the terminal side to feed back the CSI corresponding tothe CSI-RS resource.

Preferably, before the step of the terminal side feeding backcorresponding CSI according to a CSI-RS resource, the method furthercomprises: the base station side notifying the terminal side, via thesecond higher layer signaling of the UE-Specific, a candidateconfiguration set of CSI needing to be fed back in multiple CSI-RSresources.

Preferably, the step of the base station side notifying the terminalside, via the second higher layer signaling of the UE-Specific, acandidate configuration set of CSI needing to be fed back in multipleCSI-RS resources comprises: the base station side using a bitmap tonotify the terminal side the candidate configuration set, wherein thelength of the bitmap is 3 or 4 or 7 or 8 respectively corresponding todifferent aggregation and/or interference assumption modes of CSI, andeach bit in the bitmap corresponds to a different aggregation and/orinterference assumption measurement feedback mode of CSI-RS resourcesconfigured.

Preferably, the step of the base station side instructs the terminalside to feed back the CSI corresponding to the CSI-RS resourcecomprises: the base station side dynamically instructing the terminal toselect and feedback corresponding CSI via feedback triggering signalingbits in DCI Format 0 or DCI format 4 or a random access response oruplink scheduling grant signaling, and/or the base station sidedynamically instructing the terminal to select and feedbackcorresponding CSI via a resource position where DCI Format 0 or DCIformat 4 or a random access response or uplink scheduling grantsignaling which belongs to the terminal and is blindly detected by theterminal side is located, wherein the CSI-RS resource comprises a CSI-RSresource for measuring CSI of which the terminal side is notified viathe first higher layer signaling or a candidate configuration side ofwhich the terminal side is notified via the second higher layersignaling.

Preferably, the resource position where DCI format 4 or a random accessresponse or uplink scheduling grant signaling is located comprises atleast one of: the starting position of a corresponding CCE, acorresponding aggregation level, a corresponding subframe number and acorresponding system frame number and a region instruction of acorresponding higher layer signaling configuration.

Preferably, when the number of the CSI-RS resources is 1, the feedbacktriggering signaling bit of DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is 1 bit, where 0represents not triggering CSI of the CSI-RS resource, and 1 representstriggering the CSI of the CSI-RS resource.

Preferably, when the number of the CSI-RS resources is 2 or 3, thefeedback triggering signaling bits in DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling are 2 bits,where 00 represents not triggering CSI of any one of CSI-RS resources,and 01-11 respectively represent triggering CSI of different aggregationmodes and/or interference assumptions of the CSI-RS resource.

Preferably, when the number of the CSI-RS resources is 2 or 3, thefeedback triggering signaling bit of DCI Format 0 or DCI format 4 or therandom access response or uplink scheduling grant signaling is 1 bit,and the terminal side is instructed, via the resource position where DCIFormat 0 or DCI format 4 or the random access response or uplinkscheduling grant signaling is located and the feedback triggeringsignaling 1 bit, to feed back CSI of different aggregation modes and/orinterference assumptions of the CSI-RS resources.

Preferably, when the number of the CSI-RS resources is 2 or 3, theterminal side is instructed, via the resource position where DCI Format0 or DCI format 4 or the random access response or uplink schedulinggrant signaling is located, to feed back CSI of different aggregationmodes and/or interference assumptions of the CSI-RS resources.

Preferably, when the number of the CSI-RS resources is 2 or 3, the basestation side notifies the terminal side, via the second higher layersignaling of the UE-Specific, N pieces of candidate CSI of differentaggregation modes and/or interference assumptions of the CSI-RSresources, where N>0; and the terminal side is instructed, via theresource position where DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is located, to feedback CSI of different aggregation modes and/or interference assumptionsof the CSI-RS resources.

Preferably, when the number of the CSI-RS resources is 2 or 3, the basestation side notifies the terminal side, via the second higher layersignaling of the UE-Specific, N pieces of candidate CSI of differentaggregation modes and/or interference assumptions of the CSI-RSresources, where N>0; and the terminal side is instructed, via thefeedback triggering signaling in DCI Format 0 or DCI format 4 or therandom access response or uplink scheduling grant signaling, to feedback CSI of different aggregation modes and/or interference assumptionsof the CSI-RS resources.

Preferably, when the number of the CSI-RS resources is 2 or 3, the basestation side notifies the terminal side, via the second higher layersignaling of the UE-Specific, N pieces of candidate CSI of differentaggregation modes and/or interference assumptions of the CSI-RSresources, where N>0; and the terminal side is instructed, via thefeedback triggering signaling in DCI Format 0 or DCI format 4 or therandom access response or uplink scheduling grant signaling, and via theresource position where DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is located, to feedback CSI of different aggregation modes and/or interference assumptionsof the CSI-RS resources.

According to another aspect of the present invention, a base station isprovided, comprising: a first notification module, configured to notifya terminal side, via the first higher layer signaling of a UE-Specific,a CSI-RS resource for measuring CSI, the CSI-RS resource comprising atleast one of: the time frequency position of the CSI-RS resource in asubframe, the antenna port number configuration of the CSI-RS resource,the period of the CSI-RS resource and subframe offset, the sequenceidentifier of the CSI-RS resource, and the power control information ofthe CSI-RS resource; and an instruction module, configured to instructthe terminal side to feed back the CSI corresponding to the CSI-RSresource.

Preferably, the base station further includes: a second notificationmodule, configured to notify, when the CSI-RS resources are multiple,the terminal side, via the second higher layer signaling of theUE-Specific, a candidate configuration set of CSI needing to be fed backin the multiple CSI-RS resources.

Preferably, the second notification module includes: a candidatenotification sub-module, configured to notify the terminal side thecandidate configuration set via a bitmap, wherein the length of thebitmap is 3 or 4 or 7 or 8, and each bit in the bitmap corresponds to adifferent aggregation and/or interference assumption measurementfeedback mode of CSI-RS resources configured.

Preferably, the instruction module includes: a dynamic instructionsub-module, configured to dynamically instruct the terminal, viafeedback triggering signaling bits in DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling, and/or viaa resource position where DCI Format 0 or DCI format 4 or a randomaccess response or uplink scheduling grant signaling which belongs tothe terminal and is blindly detected by the terminal side is located, toselect and feedback corresponding CSI.

In the present invention, the base station side flexibly configures theterminal side to feed back various kinds of CSI information, thusenabling the base station side to flexibly and dynamically acquire theCSI, and in turn realizing precise link self-adaption and datatransmission, and reducing the uplink feedback overhead and measurementcomplexity of the terminal side.

BRIEF DESCRIPTION OF THE DRAWINGS

Drawings, provided for further understanding of the disclosure andforming a part of the specification, are used to explain the disclosuretogether with embodiments of the disclosure rather than to limit thedisclosure. In the drawings:

FIG. 1 is a flowchart of a method for instructing CSI feedback signalingconfiguration according to the embodiments of the present invention; and

FIG. 2 is a structural block diagram of a base station for instructingand configuring CSI according to the embodiments of the presentinvention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The disclosure is described below with reference to the accompanyingdrawings and embodiments in detail. Note that, the embodiments of thedisclosure and the features of the embodiments can be combined with eachother if there is no conflict.

FIG. 1 is a flowchart of a method for instructing CSI feedback signalingconfiguration according to the embodiments of the present invention. Asshown in FIG. 1, the method includes the following steps:

Step S102, a base station side notifies a terminal side, via the higherlayer signaling of a UE-Specific, a CSI-RS resource for measuring CSI,the CSI-RS resource for measuring CSI comprising at least one of: thetime frequency position of the corresponding CSI-RS resource in asubframe, the antenna port number configuration of the correspondingCSI-RS resource, the period of the corresponding CSI-RS resource andsubframe offset, the sequence identifier of the corresponding CSI-RSresource, and the power control information of the corresponding CSI-RSresource.

Step S104, the base station side instructs the terminal, via a physicallayer dynamic signaling, to select and feedback a corresponding CSIresource.

In the present embodiment, the base station side flexibly configures theterminal side to feed back various kinds of CSI information, thusenabling the base station side to flexibly and dynamically acquire theCSI, and in turn realizing precise link self-adaption and datatransmission, and reducing the uplink feedback overhead and measurementcomplexity of the terminal side.

In the above-mentioned embodiment, CSI-RS resources for measuring CSI ofwhich the terminal side is notified may be multiple sets. Where thereare multiple sets of CSI-RS resources, before step S104, the basestation side may also notify the terminal side, via the higher layersignaling of the UE-Specific, a candidate configuration set used forinstructing the terminal side to feed back CSI which the base stationrequires the terminal to feed back (step S1022).

In step S102, notifying the terminal side, via the higher layersignaling of the UE-Specific, a candidate configuration set used forinstructing the terminal side to feed back CSI which the base stationrequires the terminal to feed back may use a bitmap notification mode.The fixed bitmap length is 3 or 4 or 7 or 8, wherein each bit in thebitmap corresponds to a different aggregation and/or interferenceassumption measurement feedback mode of CSI-RS resources configured.

In step S104, dynamically instructing the terminal to select andfeedback a corresponding CSI resource in the candidate set comprises:the base station side dynamically instructing the terminal, via feedbacktriggering signaling bits in DCI Format 0 or DCI format 4 or a randomaccess response or uplink scheduling grant signaling, and/or via aresource position where DCI Format 0 or DCI format 4 or a random accessresponse or uplink scheduling grant signaling which belongs to theterminal and is blindly detected by the terminal side is located, toselect and feedback corresponding CSI.

The resource position where DCI Format 0 or DCI format 4 or a randomaccess response or uplink scheduling grant signaling is locatedcomprises at least one of: the starting position of a corresponding CCE,a corresponding aggregation level, a corresponding subframe number and acorresponding system frame number.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 1,notifying the terminal side, via the higher layer signaling of theUE-Specific, a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back is not enabled, or the base station side does notrequire to configure corresponding higher layer signaling for theterminal side. Dynamically instructing the terminal to select from thecandidate set and feedback a corresponding CSI resource comprises thatthe feedback triggering signaling bit of DCI Format 0 or DCI format 4 orthe random access response or uplink scheduling grant signaling is 1bit, where 0 represents not triggering CSI of a CSI-RS resource of ahigher layer configuration, and 1 represents triggering CSI of a CSI-RSresource of the higher layer configuration.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 2,notifying the terminal side, via the higher layer signaling of theUE-Specific, a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back is not enabled, or the base station side does notrequire to configure corresponding higher layer signaling for theterminal side. The candidate set is a CSI-RS resource measurement set ofthe terminal side of the higher layer signaling configuration, used fordynamically instructing the terminal to select from the candidate setand feedback a corresponding CSI resource comprises that the feedbacktriggering signaling bits of DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling are 2 bits, where00 represents not triggering CSI of any one of CSI-RS resources of ahigher layer configuration, and 01-11 respectively represent triggeringCSI of different aggregation modes and/or interference assumptions ofthe CSI-RS resources of the higher layer configuration.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 2,notifying the terminal side, via the higher layer signaling of theUE-Specific, a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back is not enabled, or the base station side does notrequire to configure corresponding higher layer signaling for theterminal side. The candidate set is a CSI-RS resource measurement set ofthe terminal side of the higher layer signaling configuration, used fordynamically instructing the terminal to select from the candidate setand feedback a corresponding CSI resource comprises that the feedbacktriggering signaling bit of DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is 1 bit; inaddition, the resource position where DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling is locatedneeds to be taken into consideration to determine to feed back CSI ofdifferent aggregation modes and/or interference assumptions of theCSI-RS resources.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 2,notifying the terminal side, via the higher layer signaling of theUE-Specific, a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back is not enabled, or the base station side does notrequire to configure corresponding higher layer signaling for theterminal side. The candidate set is a CSI-RS resource measurement set ofthe terminal side of the higher layer signaling configuration, used fordynamically instructing the terminal to select from the candidate setand feedback a corresponding CSI resource comprises determining to feedback CSI of different aggregation modes and/or interference assumptionsof the CSI-RS resources via the resource position where DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling is located.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 2, theterminal side is notified, via the higher layer signaling of theUE-Specific, of a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back and the UE is notified of candidate CSI ofdifferent aggregation modes and/or interference assumptions of the 2CSI-RS resources. Dynamically instructing the terminal to select fromthe candidate set and feedback a corresponding CSI resource comprisesdetermining to feed back CSI of different aggregation modes and/orinterference assumptions of the CSI-RS resources via the resourceposition where DCI Format 0 or DCI format 4 or a random access responseor uplink scheduling grant signaling is located.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 2, theterminal side is notified, via the higher layer signaling of theUE-Specific, of a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back and the UE is notified of candidate CSI ofdifferent aggregation modes and/or interference assumptions of the 2CSI-RS resources. Dynamically instructing the terminal to select fromthe candidate set and feedback a corresponding CSI resource comprisesthat the feedback triggering signaling bits of DCI Format 0 or DCIformat 4 or the random access response or uplink scheduling grantsignaling are 2 bits, where 00 represents not triggering CSI of any oneof CSI-RS resources of the candidate set of a higher layerconfiguration, and 01-11 respectively represent triggering CSI ofdifferent aggregation modes and/or interference assumptions of theCSI-RS resources of the candidate set of the higher layer configuration.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 2, theterminal side is notified, via the higher layer signaling of theUE-Specific, of a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back and the UE is notified of candidate CSI ofdifferent aggregation modes and/or interference assumptions of the 2CSI-RS resources. Dynamically instructing the terminal to select fromthe candidate set and feedback a corresponding CSI resource comprisesthat the feedback triggering signaling bit of DCI Format 0 or DCI format4 or the random access response or uplink scheduling grant signaling is1 bit; in addition, the resource position where DCI Format 0 or DCIformat 4 or a random access response or uplink scheduling grantsignaling is located needs to be taken into consideration to determineto feed back CSI of different aggregation modes and/or interferenceassumptions of the CSI-RS resources.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 3,notifying the terminal side, via the higher layer signaling of theUE-Specific, a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back is not enabled, or the base station side does notrequire to configure corresponding higher layer signaling for theterminal side. The candidate set is a CSI-RS resource measurement set ofthe terminal side of the higher layer signaling configuration, used fordynamically instructing the terminal to select from the candidate setand feedback a corresponding CSI resource comprises that the feedbacktriggering signaling bit of DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is 1 bit; inaddition, the resource position where DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling is locatedneeds to be taken into consideration to determine to feed back CSI ofdifferent aggregation modes and/or interference assumptions of theCSI-RS resources.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 3,notifying the terminal side, via the higher layer signaling of theUE-Specific, a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back is not enabled, or the base station side does notrequire to configure corresponding higher layer signaling for theterminal side. The candidate set is a CSI-RS resource measurement set ofthe terminal side of the higher layer signaling configuration, used fordynamically instructing the terminal to select from the candidate setand feedback a corresponding CSI resource comprises that the feedbacktriggering signaling bit of DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is 2 bit; inaddition, the resource position where DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling is locatedneeds to be taken into consideration to determine to feed back CSI ofdifferent aggregation modes and/or interference assumptions of theCSI-RS resources.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 3, theterminal side is notified, via the higher layer signaling of theUE-Specific, of a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back and the UE is notified of candidate CSI ofdifferent aggregation modes and/or interference assumptions of the 3CSI-RS resources. Dynamically instructing the terminal to select fromthe candidate set and feedback a corresponding CSI resource comprisesthat the feedback triggering signaling bits of DCI Format 0 or DCIformat 4 or the random access response or uplink scheduling grantsignaling are 1 bits, where 0 represents not triggering CSI of any oneof CSI-RS resources of the candidate set of a higher layerconfiguration, and 1 represents triggering CSI of different aggregationmodes and/or interference assumptions of the CSI-RS resources of thecandidate set of the higher layer configuration.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 3, theterminal side is notified, via the higher layer signaling of theUE-Specific, of a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back and the UE is notified of candidate CSI ofdifferent aggregation modes and/or interference assumptions of the 3CSI-RS resources. Dynamically instructing the terminal to select fromthe candidate set and feedback a corresponding CSI resource comprisesthat the feedback triggering signaling bits of DCI Format 0 or DCIformat 4 or the random access response or uplink scheduling grantsignaling are 1 bits, where 0 represents not triggering CSI of any oneof CSI-RS resources of the candidate set of a higher layerconfiguration, and 1 represents triggering CSI of different aggregationmodes and/or interference assumptions of the CSI-RS resources of thecandidate set of the higher layer configuration.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 3, theterminal side is notified, via the higher layer signaling of theUE-Specific, of a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back and the UE is notified of candidate CSI ofdifferent aggregation modes and/or interference assumptions of the 3CSI-RS resources. Dynamically instructing the terminal to select fromthe candidate set and feedback a corresponding CSI resource comprisesthat the feedback triggering signaling bits of DCI Format 0 or DCIformat 4 or the random access response or uplink scheduling grantsignaling are 2 bits, where 00 represents not triggering CSI of any oneof CSI-RS resources of the candidate set of a higher layerconfiguration, and 01-11 respectively represent triggering CSI ofdifferent aggregation modes and/or interference assumptions of theCSI-RS resources of the candidate set of the higher layer configuration.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 3, theterminal side is notified, via the higher layer signaling of theUE-Specific, of a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back and the UE is notified of candidate CSI ofdifferent aggregation modes and/or interference assumptions of the 3CSI-RS resources. Dynamically instructing the terminal to select fromthe candidate set and feedback a corresponding CSI resource comprisesthat the feedback triggering signaling bit of DCI Format 0 or DCI format4 or the random access response or uplink scheduling grant signaling is1 bit; in addition, the resource position where DCI Format 0 or DCIformat 4 or a random access response or uplink scheduling grantsignaling is located needs to be taken into consideration to determineto feed back CSI of different aggregation modes and/or interferenceassumptions of the CSI-RS resources.

When the higher layer signaling of the UE-Specific notifies the terminalside that the number of CSI-RS resources for measuring CSI is 3, theterminal side is notified, via the higher layer signaling of theUE-Specific, of a candidate configuration set used for instructing theterminal side to feed back CSI which the base station requires theterminal to feed back and the UE is notified of candidate CSI ofdifferent aggregation modes and/or interference assumptions of the 3CSI-RS resources. Dynamically instructing the terminal to select fromthe candidate set and feedback a corresponding CSI resource comprisesthat the feedback triggering signaling bit of DCI Format 0 or DCI format4 or the random access response or uplink scheduling grant signaling is2 bit; in addition, the resource position where DCI Format 0 or DCIformat 4 or a random access response or uplink scheduling grantsignaling is located needs to be taken into consideration to determineto feed back CSI of different aggregation modes and/or interferenceassumptions of the CSI-RS resources.

The different aggregation modes in the above-mentioned embodiment referto at least includes one of: whether the CSI feedback is triggered ornot, selection and feedback of different CSI, and selection and feedbackof different CSI combinations or aggregations. The DCI Format 0 or DCIformat 4 or random access response or uplink scheduling grant signalingin the above-mentioned embodiment respectively refers to DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling including terminal feedback triggering signaling.

FIG. 2 is a structural block diagram of a base station for instructingand configuring CSI according to the embodiments of the presentinvention. As shown in FIG. 2, the base station includes: a firstnotification module 10, configured to notify a terminal side, via thefirst higher layer signaling of a UE-Specific, a CSI-RS resource formeasuring CSI; and an instruction module 20, configured to instruct theterminal side to feed back the CSI corresponding to the CSI-RS resource.The first notification module 10 and the instruction module 20 arecoupled.

In the present embodiment, the base station side flexibly configures theterminal side to feed back various kinds of CSI information, thusenabling the base station side to flexibly and dynamically acquire theCSI, and in turn realizing precise link self-adaption and datatransmission, and reducing the uplink feedback overhead and measurementcomplexity of the terminal side.

The base station further includes: a second notification module 30,configured to notify, when the CSI-RS resources are multiple, theterminal side, via the second higher layer signaling of the UE-Specific,a candidate configuration set of CSI needing to be fed back in themultiple CSI-RS resources.

The second notification module 30 includes: a candidate notificationsub-module, configured to notify the terminal side the candidateconfiguration set via a bitmap, wherein the length of the bitmap is 3 or4 or 7 or 8, and each bit in the bitmap corresponds to a differentaggregation and/or interference assumption measurement feedback mode ofCSI-RS resources configured.

The instruction module 20 includes: a dynamic instruction sub-module,configured to dynamically instruct the terminal, via feedback triggeringsignaling bits in DCI Format 0 or DCI format 4 or a random accessresponse or uplink scheduling grant signaling, and/or via a resourceposition where DCI Format 0 or DCI format 4 or a random access responseor uplink scheduling grant signaling which belongs to the terminal andis blindly detected by the terminal side is located, to select andfeedback corresponding CSI.

Embodiment 1

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, a set of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 a set of CSI-RS resources for measuring CSI, the basestation side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is a set of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of a CSI-RS resource of a higher layerconfiguration, and 1 represents triggering CSI of a CSI-RS resource ofthe higher layer configuration.

Embodiment 2

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, a set of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 a set of CSI-RS resources for measuring CSI, the basestation side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is a set of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 2 bits of the feedback triggering signaling bits in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 00represents not triggering CSI of a CSI-RS resource of a higher layerconfiguration; 01 represents triggering to feed back CSI calculated bycombining a CSI-RS resource of the higher layer configuration and afirst IMR; 10 represents triggering to feed back CSI calculated bycombining a CSI-RS resource of the higher layer configuration and asecond IMR (interference measurement resource); and 11 reserves orrepresents triggering to feed back CSI calculated by combining a CSI-RSresource of the higher layer configuration and a third IMR.

Embodiment 3

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, a set of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 a set of CSI-RS resources for measuring CSI, the basestation side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is a set of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of a CSI-RS resource of a higher layerconfiguration, and 1 represents triggering to feed back CSI calculatedby combining a CSI-RS resource of the higher layer configuration and Nth(N>0) IMR; moreover, a resource position where DCI Format 0 or DCIformat 4 or a random access response or uplink scheduling grantsignaling is located is used to determine to feed back CSI of differentaggregation modes and/or interference assumptions of CSI-RS resources.If the initial CCE position of DCI Format 0 or DCI format 4 or therandom access response or uplink scheduling grant signaling is nCCE,offset, and nCCE, offset is an offset CCE number of the actual DCI withrespect to an initial blind detection position, when the aggregationlevel L=1, nCCE, offset=0/2/4 or L=2, nCCE, offset=0/4/8 or L=3, nCCE,offset=0 or L=4, nCCE, offset=0, CSI calculated by combining a CSI-RSresource of the higher layer configuration and a first IMR is selectedand fed back; and when the aggregation level L=1, nCCE, offset=1/3/5 orL=2, nCCE, offset=2/6/10 or L=3, nCCE, offset=4 or L=4, nCCE, offset=8,CSI calculated by combining a CSI-RS resource of the higher layerconfiguration and a second IMR is selected and fed back.

Embodiment 4

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, a set of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 a set of CSI-RS resources for measuring CSI, the basestation side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is a set of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of a CSI-RS resource of a higher layerconfiguration, and 1 represents triggering to feed back CSI calculatedby combining a CSI-RS resource of the higher layer configuration and Nth(N>0) IMR; moreover, a resource position where DCI Format 0 or DCIformat 4 or a random access response or uplink scheduling grantsignaling is located is used to determine to feed back CSI of differentaggregation modes and/or interference assumptions of CSI-RS resources.If a subframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an evennumber of subframe, CSI calculated by combining a CSI-RS resource of thehigher layer configuration and a first IMR is selected and fed back; andif a subframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an oddnumber of subframe, CSI calculated by combining a CSI-RS resource of thehigher layer configuration and a second IMR is selected and fed back.

Embodiment 5

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, a set of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 a set of CSI-RS resources for measuring CSI, the basestation side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is a set of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of a CSI-RS resource of a higher layerconfiguration, and 1 represents triggering to feed back CSI calculatedby combining a CSI-RS resource of the higher layer configuration and Nth(N>0) IMR; moreover, a resource position where DCI Format 0 or DCIformat 4 or a random access response or uplink scheduling grantsignaling is located is used to determine to feed back CSI of differentaggregation modes and/or interference assumptions of CSI-RS resources.If a subframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an evennumber of system frame, CSI calculated by combining a CSI-RS resource ofthe higher layer configuration and a first IMR is selected and fed back;and if a subframe where DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is located is anodd number of system frame, CSI calculated by combining a CSI-RSresource of the higher layer configuration and a second IMR is selectedand fed back.

Embodiment 6

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering CSI of two setsof CSI-RS resources of the higher layer configuration.

Embodiment 7

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering to feed back CSIof all the possible aggregation modes and/or interference assumptions oftwo sets of CSI-RS resources of the higher layer configuration.

Embodiment 8

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering to feed back CSIof aggregation modes and/or interference assumptions of two sets ofCSI-RS resources of the higher layer configuration. which CSI ofaggregation modes and/or interference assumptions should be fed back isdetermined by a resource position of DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling. If theinitial CCE position of DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is nCCE, offset,and nCCE, offset is an offset CCE number of the actual DCI with respectto an initial blind detection position, when the aggregation level L=1,nCCE, offset=0/2/4 or L=2, nCCE, offset=0/4/8 or L=3, nCCE, offset=0 orL=4, nCCE, offset=0, CSI of a first aggregation mode and/or interferenceassumption of a higher layer configuration is selected and fed back; andwhen the aggregation level L=1, nCCE, offset=1/3/5 or L=2, nCCE,offset=2/6/10 or L=3, nCCE, offset=4 or L=4, nCCE, offset=8, CSI of asecond aggregation mode and/or interference assumption of the higherlayer configuration is selected and fed back.

Embodiment 9

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering to feed back CSIof aggregation modes and/or interference assumptions of two sets ofCSI-RS resources of the higher layer configuration. which CSI ofaggregation modes and/or interference assumptions should be fed back isdetermined by a resource position of DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling. If asubframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an evennumber of system frame, CSI of a first aggregation mode and/orinterference assumption of a higher layer configuration is selected andfed back; and if a subframe where DCI Format 0 or DCI format 4 or therandom access response or uplink scheduling grant signaling is locatedis an odd number of system frame, CSI of a second aggregation modeand/or interference assumption of the higher layer configuration isselected and fed back.

Embodiment 10

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering to feed back CSIof aggregation modes and/or interference assumptions of two sets ofCSI-RS resources of the higher layer configuration. which CSI feedbackof aggregation modes and/or interference assumptions should be performedis determined by a resource position of DCI Format 0 or DCI format 4 ora random access response or uplink scheduling grant signaling. If asubframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an evennumber of subframe, CSI of a first aggregation mode and/or interferenceassumption of a higher layer configuration is selected and fed back; andif a subframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an oddnumber of subframe, CSI of a second aggregation mode and/or interferenceassumption of the higher layer configuration is selected and fed back.

Embodiment 11

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 2 bits of the feedback triggering signaling bits in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 00represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration; 01 represents triggering a first aggregationmode and/or interference measurement mode of CSI of two sets of CSI-RSresources of the higher layer configuration; 10 represents triggering asecond aggregation mode and/or interference measurement mode of CSI oftwo sets of CSI-RS resources of the higher layer configuration; and 11represents triggering a third aggregation mode and/or interferencemeasurement mode of CSI of two sets of CSI-RS resources of the higherlayer configuration.

Embodiment 12

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 2 bits of the feedback triggering signaling bits in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 00represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration; 01 represents triggering first and secondaggregation modes and/or interference measurement modes of CSI of twosets of CSI-RS resources of the higher layer configuration; 10represents triggering third and fourth aggregation modes and/orinterference measurement modes of CSI of two sets of CSI-RS resources ofthe higher layer configuration; and 11 represents triggering fifth andsixth aggregation modes and/or interference measurement modes of CSI oftwo sets of CSI-RS resources of the higher layer configuration Inaddition, the need of selecting and feeding back one aggregation modeand/or interference measurement mode of CSI from every two aggregationmodes and/or interference measurement modes may be determined by CSI ofaggregations modes and/or interference assumptions via a resourceposition where DCI Format 0 or DCI format 4 or a random access responseor uplink scheduling grant signaling is located. If the initial CCEposition of DCI Format 0 or DCI format 4 or the random access responseor uplink scheduling grant signaling is nCCE, offset, and nCCE, offsetis an offset CCE number of the actual DCI with respect to an initialblind detection position, when the aggregation level L=1, nCCE,offset=0/2/4 or L=2, nCCE, offset=0/4/8 or L=3, nCCE, offset=0 or L=4,nCCE, offset=0, CSI of a first aggregation mode and/or interferenceassumption of a higher layer configuration is selected and fed back; andwhen the aggregation level L=1, nCCE,offset=1/3/5 or L=2, nCCE,offset=2/6/10 or L=3, nCCE, offset=4 or L=4, nCCE, offset=8, CSI of asecond aggregation mode and/or interference assumption of the higherlayer configuration is selected and fed back.

Embodiment 13

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 2 bits of the feedback triggering signaling bits in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 00represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration; 01 represents triggering first and secondaggregation modes and/or interference measurement modes of CSI of twosets of CSI-RS resources of the higher layer configuration; 10represents triggering third and fourth aggregation modes and/orinterference measurement modes of CSI of two sets of CSI-RS resources ofthe higher layer configuration; and 11 represents triggering fifth andsixth aggregation modes and/or interference measurement modes of CSI oftwo sets of CSI-RS resources of the higher layer configuration Inaddition, the need of selecting and feeding back one aggregation modeand/or interference measurement mode of CSI from every two aggregationmodes and/or interference measurement modes may be determined by CSI ofaggregations modes and/or interference assumptions via a resourceposition where DCI Format 0 or DCI format 4 or a random access responseor uplink scheduling grant signaling is located. If a subframe where DCIFormat 0 or DCI format 4 or the random access response or uplinkscheduling grant signaling is located is an even number of subframe, CSIof a first aggregation mode and/or interference assumption of a higherlayer configuration is selected and fed back; and if a subframe whereDCI Format 0 or DCI format 4 or the random access response or uplinkscheduling grant signaling is located is an odd number of subframe, CSIof a second aggregation mode and/or interference assumption of thehigher layer configuration is selected and fed back.

Embodiment 14

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is two sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 2 bits of the feedback triggering signaling bits in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 00represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration; 01 represents triggering first and secondaggregation modes and/or interference measurement modes of CSI of twosets of CSI-RS resources of the higher layer configuration; 10represents triggering third and fourth aggregation modes and/orinterference measurement modes of CSI of two sets of CSI-RS resources ofthe higher layer configuration; and 11 represents triggering fifth andsixth aggregation modes and/or interference measurement modes of CSI oftwo sets of CSI-RS resources of the higher layer configuration Inaddition, the need of selecting and feeding back one aggregation modeand/or interference measurement mode of CSI from every two aggregationmodes and/or interference measurement modes may be determined by CSI ofaggregations modes and/or interference assumptions via a resourceposition where DCI Format 0 or DCI format 4 or a random access responseor uplink scheduling grant signaling is located. If a subframe where DCIFormat 0 or DCI format 4 or the random access response or uplinkscheduling grant signaling is located is an even number of system frame,CSI of a first aggregation mode and/or interference assumption of ahigher layer configuration is selected and fed back; and if a subframewhere DCI Format 0 or DCI format 4 or the random access response oruplink scheduling grant signaling is located is an odd number of systemframe, CSI of a second aggregation mode and/or interference assumptionof the higher layer configuration is selected and fed back.

Embodiment 15

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manner: Triggerresource 1 (x y).

The first bit represents x representing whether to feed back CSI of afirst CSI-RS resource configured; the second bit represents yrepresenting whether to feed back CSI of a second CSI-RS resourceconfigured; 0 represents not feeding back corresponding CSI; and 1represents feeding back corresponding CSI. If x and y are equal to 1 atthe same time, then aggregated CSI of the first CSI-RS resource and thesecond CSI-RS resource needs to be fed back.

Via 1 bit of the feedback triggering signaling bit in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the candidate set, where 0 represents nottriggering to feed back CSI of a CSI-RS resource in the candidate set,and 1 represents triggering CSI of a CSI-RS resource in the candidateset.

Embodiment 16

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manner:

-   -   Trigger resource 1 (x y z)

The first bit x represents whether to feed back CSI of a first CSI-RSresource configured; the second bit y represents whether to feed backCSI of a second CSI-RS resource configured; the third bit z representswhether to feed back aggregated CSI of the first CSI-RS resource and thesecond CSI-RS resource; 0 represents not feeding back corresponding CSI;and 1 represents feeding back corresponding CSI.

Via 1 bit of the feedback triggering signaling bit in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the candidate set, where 0 represents nottriggering to feed back CSI of a CSI-RS resource in the candidate set,and 1 represents triggering CSI of a CSI-RS resource in the candidateset. Bits in different Trigger resources may represent different IMRassumption conditions of the same or different CSI-RS resources.

Embodiment 17

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manners:

-   -   Trigger resource 1 (x1 y1 z1)    -   Trigger resource 2 (x2 y2 z2)    -   Trigger resource 3 (x3 y3 z3)

The first bit xn represents whether to feed back CSI of a first CSI-RSresource configured; the second bit yn represents whether to feed backCSI of a second CSI-RS resource configured; the third bit zn representswhether to feed back aggregated CSI of the first CSI-RS resource and thesecond CSI-RS resource; 0 represents not feeding back corresponding CSI;and 1 represents feeding back corresponding CSI. Bits in differentTrigger resources may represent different IMR assumption conditions ofthe same or different CSI-RS resources.

Via 2 bits of the feedback triggering signaling bits in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the corresponding candidate set, where 00represents not triggering to feed back CSI of a CSI-RS resource in thecandidate set; 01 represents triggering CSI of Trigger resource 1 in thecandidate set; 10 represents triggering CSI of Trigger resource 2 in thecandidate set; and 11 represents triggering CSI of Trigger resource 3 inthe candidate set.

Embodiment 18

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, two sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 two sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manners:

-   -   Trigger resource 1 (x1 y1 z1)    -   Trigger resource 2 (x2 y2 z2)    -   Trigger resource 3 (x3 y3 z3)    -   Trigger resource 4 (x4 y4 z4)    -   Trigger resource 5 (x5 y5 z5)    -   Trigger resource 6 (x6 y6 z6)

The first bit xn represents whether to feed back CSI of a first CSI-RSresource configured; the second bit yn represents whether to feed backCSI of a second CSI-RS resource configured; the third bit zn representswhether to feed back aggregated CSI of the first CSI-RS resource and thesecond CSI-RS resource; 0 represents not feeding back corresponding CSI;and 1 represents feeding back corresponding CSI. Bits in differentTrigger resources may represent different IMR assumption conditions ofthe same or different CSI-RS resources.

Via 2 bits of the feedback triggering signaling bits in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the corresponding candidate set, where 00represents not triggering to feed back CSI of a CSI-RS resource in thecandidate set; 01 represents triggering CSI of Trigger resource 1 andTrigger resource 2 in the candidate set; 10 represents triggering CSI ofTrigger resource 3 and Trigger resource 4 in the candidate set; and 11represents triggering CSI of Trigger resource 5 and Trigger resource 6in the candidate set.

In addition, the need of selecting and feeding back one aggregation modeand/or interference measurement mode of CSI from every two Triggerresources may be determined by CSI of aggregations modes and/orinterference assumptions via a resource position where DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling is located. If the initial CCE position of DCI Format 0 or DCIformat 4 or the random access response or uplink scheduling grantsignaling is nCCE, offset, and nCCE, offset is an offset CCE number ofthe actual DCI with respect to an initial blind detection position, whenthe aggregation level L=1, nCCE, offset=0/2/4 or L=2, nCCE, offset=0/4/8or L=3, nCCE, offset=0 or L=4, nCCE, offset=0, CSI of a first Triggerresource of a higher layer configuration is selected and fed back; andwhen the aggregation level L=1, nCCE, offset=1/3/5 or L=2, nCCE,offset=2/6/10 or L=3, nCCE, offset=4 or L=4, nCCE, offset=8, CSI of asecond Trigger resource of the higher layer configuration is selectedand fed back.

Embodiment 19

Assuming that a UE1 is a user of R11 or of a more advanced version, abase station side notifies the UE1, via the higher layer signaling of aUE-Specific, three sets of CSI-RS resources for measuring CSI. When thehigher layer signaling of the UE-Specific notifies the UE1 three sets ofCSI-RS resources for measuring CSI, the base station side does not needto configure corresponding higher layer signaling for the terminal side.A candidate set is three sets of CSI-RS resources for measuring CSIconfigured by the base station side; in addition, via 1 bit of thefeedback triggering signaling bit in DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling, the basestation side triggers the UE1 whether to feed back CSI of acorresponding CSI-RS resource, where 0 represents not triggering CSI oftwo sets of CSI-RS resources of a higher layer configuration, and 1represents triggering CSI of two sets of CSI-RS resources of the higherlayer configuration.

Embodiment 20

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is three sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering to feed back CSIof all the possible aggregation modes and/or interference assumptions oftwo sets of CSI-RS resources of the higher layer configuration.

Embodiment 21

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is three sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of three sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering to feed back CSIof aggregation modes and/or interference assumptions of three sets ofCSI-RS resources of the higher layer configuration. which CSI feedbackof aggregation modes and/or interference assumptions should be performedis determined by a resource position of DCI Format 0 or DCI format 4 ora random access response or uplink scheduling grant signaling. If theinitial CCE position of DCI Format 0 or DCI format 4 or the randomaccess response or uplink scheduling grant signaling is nCCE, offset,and nCCE, offset is an offset CCE number of the actual DCI with respectto an initial blind detection position, when the aggregation level L=1,nCCE,offset=0/2/4 or L=2, nCCE, offset=0/4/8 or L=3, nCCE, offset=0 orL=4, nCCE, offset=0, CSI of a first aggregation mode and/or interferenceassumption of a higher layer configuration is selected and fed back; andwhen the aggregation level L=1, nCCE, offset=1/3/5 or L=2, nCCE,offset=2/6/10 or L=3, nCCE, offset=4 or L=4, nCCE, offset=8, CSI of asecond aggregation mode and/or interference assumption of the higherlayer configuration is selected and fed back.

Embodiment 22

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is three sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering to feed back CSIof aggregation modes and/or interference assumptions of two sets ofCSI-RS resources of the higher layer configuration. which CSI feedbackof aggregation modes and/or interference assumptions should be performedis determined by a resource position of DCI Format 0 or DCI format 4 ora random access response or uplink scheduling grant signaling. If asubframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an evennumber of system frame, CSI of a first aggregation mode and/orinterference assumption of a higher layer configuration is selected andfed back; and if a subframe where DCI Format 0 or DCI format 4 or therandom access response or uplink scheduling grant signaling is locatedis an odd number of system frame, CSI of a second aggregation modeand/or interference assumption of the higher layer configuration isselected and fed back.

Embodiment 23

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side does not need to configure corresponding higher layersignaling for the terminal side. A candidate set is three sets of CSI-RSresources for measuring CSI configured by the base station side; inaddition, via 1 bit of the feedback triggering signaling bit in DCIFormat 0 or DCI format 4 or a random access response or uplinkscheduling grant signaling, the base station side triggers the UE1whether to feed back CSI of a corresponding CSI-RS resource, where 0represents not triggering CSI of two sets of CSI-RS resources of ahigher layer configuration, and 1 represents triggering to feed back CSIof aggregation modes and/or interference assumptions of two sets ofCSI-RS resources of the higher layer configuration. which CSI ofaggregation modes and/or interference assumptions should be fed back isdetermined by a resource position of DCI Format 0 or DCI format 4 or arandom access response or uplink scheduling grant signaling. If asubframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an evennumber of subframe, CSI of a first aggregation mode and/or interferenceassumption of a higher layer configuration is selected and fed back; andif a subframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an oddnumber of subframe, CSI of a second aggregation mode and/or interferenceassumption of the higher layer configuration is selected and fed back.

Embodiment 24

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manners:

-   -   Trigger resource 1 (x1 y1 z1)    -   Trigger resource 2 (x2 y2 z2)    -   Trigger resource 3 (x3 y3 z3)

The first bit xn represents whether to feed back CSI of a first CSI-RSresource configured; the second bit yn represents whether to feed backCSI of a second CSI-RS resource configured; the third bit zn representswhether to feed back CSI of a third CSI-RS resource configured; 0represents not feeding back corresponding CSI; and 1 represents feedingback corresponding CSI. Where any two or three bits of the same Triggerresource are 1, it represents that the corresponding two or three CSI-RSresources need aggregated feedback. Bits in different Trigger resourcesmay also represent different IMR assumption conditions of the same ordifferent CSI-RS resources.

Via 2 bits of the feedback triggering signaling bits in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the corresponding candidate set, where 00represents not triggering to feed back CSI of a CSI-RS resource in thecandidate set; 01 represents triggering CSI of Trigger resource 1 in thecandidate set; 10 represents triggering CSI of Trigger resource 2 in thecandidate set; and 11 represents triggering CSI of Trigger resource 3 inthe candidate set.

Embodiment 25

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manner:

-   -   Trigger resource 1 (x1 y1 z1)

The first bit xn represents whether to feed back CSI of a first CSI-RSresource configured; the second bit yn represents whether to feed backCSI of a second CSI-RS resource configured; the third bit zn representswhether to feed back CSI of a third CSI-RS resource configured; 0represents not feeding back corresponding CSI; and 1 represents feedingback corresponding CSI. Where any two or three bits of the same Triggerresource are 1, it represents that the corresponding two or three CSI-RSresources need aggregated feedback. Bits in different Trigger resourcesmay also represent different IMR assumption conditions of the same ordifferent CSI-RS resources.

Via 1 bit of the feedback triggering signaling bit in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the candidate set, where 0 represents nottriggering to feed back CSI of a CSI-RS resource in the candidate set,and 1 represents triggering CSI of Trigger resource 1 in the candidateset.

Embodiment 26

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manners:

-   -   Trigger resource 1 (x1 y1 z1 xx1 yy1 zz1 nn1)    -   Trigger resource 2 (x2 y2 z2 xx2 yy2 zz2 nn2)    -   Trigger resource 3 (x3 y3 z3 xx3 yy3 zz3 nn3)

The first bit xn represents whether to feed back CSI of a first CSI-RSresource configured; the second bit yn represents whether to feed backCSI of a second CSI-RS resource configured; the third bit zn representswhether to feed back CSI of a third CSI-RS resource configured; xxn,yyn, zzn, nnn (n=1, 2, 3) represents whether to feed back CSI ofaggregations or interference assumptions of various combinations of thefirst CSI-RS resource, the second CSI-RS resource and the third CSI-RSresource; 0 represents not feeding back corresponding CSI; and 1represents feeding back corresponding CSI. Bits in different Triggerresources may also represent different IMR assumptions of the same ordifferent CSI-RS resources.

Via 2 bits of the feedback triggering signaling bits in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the corresponding candidate set, where 00represents not triggering to feed back CSI of a CSI-RS resource in thecandidate set; 01 represents triggering CSI of Trigger resource 1 in thecandidate set; 10 represents triggering CSI of Trigger resource 2 in thecandidate set; and 11 represents triggering CSI of Trigger resource 3 inthe candidate set.

Embodiment 27

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manners:

-   -   Trigger resource 1 (x1 y1 z1 xx1 yy1 zz1 nn1)    -   Trigger resource 2 (x2 y2 z2 xx2 yy2 zz2 nn2)    -   Trigger resource 3 (x3 y3 z3 xx3 yy3 zz3 nn3)    -   Trigger resource 4 (x4 y4 z4 xx4 yy4 zz4 nn4)    -   Trigger resource 5 (x5 y5 z5 xx5 yy5 zz5 nn5)    -   Trigger resource 6 (x6 y6 z6 xx6 yy6 zz6 nn6)

The first bit xn represents whether to feed back CSI of a first CSI-RSresource configured; the second bit yn represents whether to feed backCSI of a second CSI-RS resource configured; the third bit zn representswhether to feed back CSI of a third CSI-RS resource configured; xxn,yyn, zzn, nnn (n=1, 2, 3, 4, 5, 6) represents whether to feed back CSIof aggregations or interference assumptions of various combinations ofthe first CSI-RS resource, the second CSI-RS resource and the thirdCSI-RS resource; 0 represents not feeding back corresponding CSI; and 1represents feeding back corresponding CSI. Bits in different Triggerresources may also represent different IMR assumptions of the same ordifferent CSI-RS resources.

Via 2 bits of the feedback triggering signaling bits in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the corresponding candidate set, where 00represents not triggering to feed back CSI of a CSI-RS resource in thecandidate set; 01 represents triggering CSI of Trigger resource 1 andTrigger resource 2 in the candidate set; 10 represents triggering CSI ofTrigger resource 3 and Trigger resource 4 in the candidate set; and 11represents triggering CSI of Trigger resource 5 and Trigger resource 6in the candidate set.

In addition, the need of selecting and feeding back one aggregation modeand/or interference measurement mode of CSI from every two Triggerresources may be determined by CSI of aggregations modes and/orinterference assumptions via a resource position where DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling is located. If the initial CCE position of DCI Format 0 or DCIformat 4 or the random access response or uplink scheduling grantsignaling is nCCE, offset, and nCCE, offset is an offset CCE number ofthe actual DCI with respect to an initial blind detection position, whenthe aggregation level L=1, nCCE, offset=0/2/4 or L=2, nCCE, offset=0/4/8or L=3, nCCE, offset=0 or L=4, nCCE, offset=0, CSI of a first Triggerresource of a higher layer configuration is selected and fed back; andwhen the aggregation level L=1, nCCE, offset=1/3/5 or L=2, nCCE,offset=2/6/10 or L=3, nCCE, offset=4 or L=4, nCCE, offset=8, CSI of asecond Trigger resource of the higher layer configuration is selectedand fed back.

Embodiment 28

In this embodiment, assuming that a UE1 is a user of R11 or of a moreadvanced version, a base station side notifies the UE1, via the higherlayer signaling of a UE-Specific, three sets of CSI-RS resources formeasuring CSI. When the higher layer signaling of the UE-Specificnotifies the UE1 three sets of CSI-RS resources for measuring CSI, thebase station side configures corresponding CSI feedback limit set higherlayer signaling, i.e. a candidate set at the terminal side. Thecandidate set may be in the following definition manners:

-   -   Trigger resource 1 (x1 y1 z1 xx1 yy1 zz1 nn1)    -   Trigger resource 2 (x2 y2 z2 xx2 yy2 zz2 nn2)    -   Trigger resource 3 (x3 y3 z3 xx3 yy3 zz3 nn3)    -   Trigger resource 4 (x4 y4 z4 xx4 yy4 zz4 nn4)    -   Trigger resource 5 (x5 y5 z5 xx5 yy5 zz5 nn5)    -   Trigger resource 6 (x6 y6 z6 xx6 yy6 zz6 nn6)

The first bit xn represents whether to feed back CSI of a first CSI-RSresource configured; the second bit yn represents whether to feed backCSI of a second CSI-RS resource configured; the third bit zn representswhether to feed back CSI of a third CSI-RS resource configured; xxn,yyn, zzn, nnn (n=1, 2, 3, 4, 5, 6) represents whether to feed back CSIof aggregations or interference assumptions of various combinations ofthe first CSI-RS resource, the second CSI-RS resource and the thirdCSI-RS resource; 0 represents not feeding back corresponding CSI; and 1represents feeding back corresponding CSI. Bits in different Triggerresources may also represent different IMR assumptions of the same ordifferent CSI-RS resources.

Via 2 bits of the feedback triggering signaling bits in DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling, the base station side triggers the UE1 whether to feed backCSI of a CSI-RS resource in the corresponding candidate set, where 00represents not triggering to feed back CSI of a CSI-RS resource in thecandidate set; 01 represents triggering CSI of Trigger resource 1 andTrigger resource 2 in the candidate set; 10 represents triggering CSI ofTrigger resource 3 and Trigger resource 4 in the candidate set; and 11represents triggering CSI of Trigger resource 5 and Trigger resource 6in the candidate set.

In addition, the need of selecting and feeding back one aggregation modeand/or interference measurement mode of CSI from every two Triggerresources may be determined by CSI of aggregations modes and/orinterference assumptions via a resource position where DCI Format 0 orDCI format 4 or a random access response or uplink scheduling grantsignaling is located. If a subframe where DCI Format 0 or DCI format 4or the random access response or uplink scheduling grant signaling islocated is an even number of system frame, CSI of a first Triggerresource of a higher layer configuration is selected and fed back; andif a subframe where DCI Format 0 or DCI format 4 or the random accessresponse or uplink scheduling grant signaling is located is an oddnumber of system frame, CSI of a second Trigger resource of the higherlayer configuration is selected and fed back.

Embodiment 29

As regards embodiments 1-27, the base station side configures differentmeasurement set sizes for the terminal side, i.e. different numbers ofCSI-RS resources of the higher layer configuration apply differentcandidate set configuration methods and numbers of configured Triggerresources and/or physical layer dynamic notification methods. Inaddition, the combination method of various signaling in the embodimentsabove may be freely configured, without being limited to the methods ofthe embodiments above. Moreover, the terminal side may be notified, viathe higher layer signaling of the UE-Specific, the IMR. Multiple CSI-RSresources may be configured with one set of IMRs, and multiple CSI-RSresources may also be configured with multiple sets of IMRs.

In another embodiment, software for instructing CSI feedback signalingconfiguration is also provided, the software being used for executingthe technical solutions described in the embodiments mentioned above.

In another embodiment, a storage medium is also provided, the storagemedium storing the software mentioned above, and the storage mediumcomprising but not limited to an optical disk, a floppy disk, a harddisk, an erasable storage device, etc.

According to the downlink CSI feedback method provided by variousembodiments of the present invention above, the base station sideflexibly configures the terminal side to feed back various kinds of CSIinformation, thus enabling the base station side to flexibly anddynamically acquire the CSI, and in turn performing precise linkself-adaption and data transmission. By means of the method of thepresent invention, the terminal side may reduce the uplink feedbackoverhead and measurement complexity.

Obviously, those skilled in the art should know that each of thementioned modules or steps of the disclosure can be realized byuniversal computing devices; the modules or steps can be focused onsingle computing device, or distributed on the network formed bymultiple computing devices; selectively, they can be realized by theprogram codes which can be executed by the computing device; thereby,the modules or steps can be stored in the storage device and executed bythe computing device; and under some circumstances, the shown ordescribed steps can be executed in different orders, or can beindependently manufactured as each integrated circuit module, ormultiple modules or steps thereof can be manufactured to be singleintegrated circuit module, thus to be realized. In this way, thedisclosure is not restricted to any particular hardware and softwarecombination.

The above description is only the preferred examples of the presentinvention, which is not used to limit the present document. Anyamendments, equivalent substitutions, improvements, etc. within theprinciple of the disclosure are all included in the scope of theprotection of the disclosure.

What is claimed is:
 1. A method for instructing CSI feedback signalingconfiguration, comprising: a base station notifying a terminal, via afirst higher layer signaling, one or more CSI-RS resources for measuringCSI, wherein the higher layer is a layer higher than a physical layer inan open system interconnection (OSI) layer model, wherein the CSI-RSresources comprises at least one of: corresponding time frequencypositions of the CSI-RS resources in a respective subframe, a number ofports configuration of the CSI-RS resources, a periodicity and asubframe offset of the CSI-RS resources, a sequence identifier of theCSI-RS resources, and power control information of the CSI-RS resources;and the base station instructing the terminal to feed back the CSIcorresponding to the one or more CSI-RS resources; wherein the step ofthe base station instructing the terminal to feed back the CSIcorresponding to the one or more CSI-RS resources comprises: the basestation dynamically instructing, through a physical layer signaling, theterminal to select and feedback corresponding CSI based on feedbacktriggering signaling bits configured for one or more DCI Formats, andbased on the DCI Format used in a resource position where DCI carryingthe feedback triggering signaling bits in the DCI Format is located;wherein the feedback triggering signaling bits in the DCI are 1 or morebits, where 0 state represents no CSI of any CSI-RS resource istriggered, and each of the rest of states respectively representstriggering CSI of one of multiple combinations of the CSI-RS resourcesand/or interference measurement resources (IMR) of the CSI; wherein atleast one of the multiple combinations of the CSI-RS resources andinterference measurement resources is combination of multiple CSI-RSresources and interference measurement resources located in a singlecarrier for aggregated CSI feedback; wherein before the step of the basestation instructing the terminal to feed back the CSI corresponding tothe one or more CSI-RS resources and interference measurement resources,the method further comprising: the base station notifying the terminal,via a second higher layer signaling, a candidate configuration set ofCSIs for CSI feedback based on the CSI-RS resources and interferencemeasurement resources, wherein the candidate configuration set indicatesthe one or more CSI-RS resources and interference measurement resourcesfor measuring CSI.
 2. The method according to claim 1, wherein thenumber of the CSI-RS resources is multiple, wherein the resourceposition where DCI is located comprises time and/or frequency domainresource position where the DCI is configured, and there is one or moresubset of resource positions and each subset of resource positionscorresponds to the combinations of CSI-RS resources and/or IMRs amongthe multiple combinations and/or IMRs.
 3. The method according to claim2, wherein the step of the base station notifying the terminal, via asecond higher layer signaling, a candidate configuration set of CSIs forCSI feedback based on the CSI-RS resources comprises: the base stationusing a bitmap to notify the terminal the candidate configuration set,and each combinations of bits in the bitmap corresponds to one ofmultiple combinations of the CSI-RS resources and/or IMRs measurementfeedback mode of the CSI.
 4. The method according to claim 1, whereinwhen the number of the CSI-RS resources is 1, the feedback triggeringsignaling bits of DCI is 1 bit, where 0 state represents no CSI of theCSI-RS resource is triggered, and 1 state represents the CSI of theCSI-RS resource is triggered.
 5. The method according to claim 1,wherein when the number of the CSI-RS resources is 2 or 3, the feedbacktriggering signaling bits in DCI are 2 bits, where 00 state representsno CSI of any CSI-RS resources is triggered.
 6. The method according toclaim 1, wherein when the number of the CSI-RS resources is 2 or 3, thefeedback triggering signaling bit in DCI is 1 bit, and the terminal isinstructed, based on the resource position where DCI is located and thefeedback triggering signaling 1 bit, to feed back CSI of one of multiplecombinations of the CSI-RS resources and/or IMRs of the CSI.
 7. Themethod according to claim 1, wherein when the number of the CSI-RSresources is 2 or 3, the terminal is instructed, based on the DCI Formatconfigured in the resource position where DCI is located, to feed backCSI of one of multiple combinations of the CSI-RS resources and/or IMRsof the CSI.
 8. The method according to claim 1, wherein when the numberof the CSI-RS resources is 2 or 3, the base station side notifies theterminal, via a second higher layer signaling, N pieces of candidate CSIof one of multiple combinations of the CSI-RS resources and/or IMRs ofthe one or more CSI, where N>0; and the terminal is instructed, based onthe DCI Format configured in the resource position where DCI is located,to feed back CSI of one of multiple combinations of the CSI-RS resourcesand/or IMRs of the CSI.
 9. The method according to claim 1, wherein whenthe number of the CSI-RS resources is 2 or 3, the base station notifiesthe terminal, via a second higher layer signaling, N pieces of candidateCSI of one of multiple combinations of the CSI-RS resources and/or IMRsof the CSI, where N>0; and the terminal is instructed, based on thefeedback triggering signaling in DCI, to feed back CSI of one ofmultiple combinations of the CSI-RS resources and/or IMRs of the CSI.10. The method according to claim 1, wherein when the number of theCSI-RS resources is 2 or 3, the base station notifies the terminal, viaa second higher layer signaling, N pieces of candidate CSI of one ofmultiple combinations of the CSI-RS resources and/or IMRs of the CSI,where N>0; and the terminal is instructed, via the feedback triggeringsignaling in DCI, and based on the DCI Format configured in the resourceposition where the DCI is located, to feed back CSI of one of multiplecombinations of the CSI-RS resources and/or IMRs of the CSI.
 11. A basestation, comprising a hardware processor and a memory, and the hardwareprocessor is configured to execute the programming modules stored in thememory, wherein the programming modules comprise: a first notificationmodule, configured to notify a terminal, via a first higher layersignaling, one or more CSI-RS resources for measuring CSI, wherein theCSI-RS resources comprising at least one of: corresponding timefrequency positions of the CSI-RS resources in a respective subframe, anumber of ports configuration of the CSI-RS resources, a periodicity anda subframe offset of the CSI-RS resources, a sequence identifier of theCSI-RS resources, and power control information of the CSI-RS resources,wherein the higher layer is a layer higher than a physical layer in anopen system interconnection (OSI) layer model; an instruction module,configured to instruct the terminal to feed back the CSI correspondingto the one or more CSI-RS resources; and a dynamic instructionsub-module, configured to dynamically instruct, through a physical layersignaling, the terminal to select and feedback corresponding CSI, basedon feedback triggering signaling bits configured for one or more DCIFormats, and based on the DCI Format configured used in a resourceposition where DCI carrying the feedback triggering signaling bits inthe DCI Format is located; wherein the feedback triggering signalingbits in the DCI are 1 or more bits, where 0 state represents no CSI ofany CSI-RS resource is triggered, and each of the rest of statesrespectively represents triggering CSI of one of multiple combinationsof the CSI-RS resources and/or interference measurement resources (IMR)of the CSI; wherein at least one of the multiple combinations of theCSI-RS resources and interference measurement resources is combinationof multiple CSI-RS resources and interference measurement resourceslocated in a single carrier for aggregated CSI feedback; wherein thebase station further comprises: a second notification module, configuredto notify, when the CSI-RS resources are multiple, the terminal via asecond higher layer signaling, a candidate configuration set of CSIs forCSI feedback based on the CSI-RS resources and interference measurementresources, wherein the candidate configuration set indicates the one ormore CSI-RS resources and interference measurement resources formeasuring CSI.
 12. The base station according to claim 11, wherein theresource position where DCI is located comprises time and/or frequencydomain resource position where the DCI Format is configured, and thereis one or more subset of resource positions and each subset of resourcepositions corresponds to one of the combinations of CSI-RS resourcesand/or IMRs among the multiple combinations and/or interferenceassumptions.
 13. The base station according to claim 12, wherein thesecond notification module comprises: a candidate notificationsub-module, configured to notify the terminal the candidateconfiguration set via a bitmap, and each combinations of the bits in thebitmap corresponds to one of multiple combinations of the CSI-RSresources and/or IMR measurement feedback mode of the CSI.
 14. Aterminal, comprising a hardware processor and a memory, and the hardwareprocessor is configured to execute the programming modules stored in thememory, wherein the programming modules comprise: a first receivingmodule, configured to receive one or more CSI-RS resources for measuringCSI from a base station via a first higher layer signaling, the CSI-RSresources comprising at least one of: corresponding time frequencypositions of the CSI-RS resources in a respective subframe, a number ofports configuration of the CSI-RS resources, a periodicity and asubframe offset of the CSI-RS resources, a sequence identifier of theCSI-RS resources, and power control information of the CSI-RS resources,wherein the higher layer is a layer higher than a physical layer in anopen system interconnection (OSI) layer model; a selection module,configured to select and feedback CSI corresponding to the one or moreCSI-RS resource according to the received first higher layer signaling;and a dynamic receiving sub-module, configured to receive, through aphysical layer signaling, feedback triggering signaling bits configuredfor one or more DCI Formats, and receive the DCI used in a resourceposition where DCI carrying the DCI Format is located; wherein thefeedback triggering signaling bits in the DCI are 1 or more bits, where0 state represents no CSI of any CSI-RS resource is triggered, and eachof the rest of states respectively represents triggering CSI of one ofmultiple combinations of the CSI-RS resources and/or interferencemeasurement resources (IMR) of the CSI; wherein at least one of themultiple combinations of the CSI-RS resources and interferencemeasurement resources is combination of multiple CSI-RS resources andinterference measurement resources located in a single carrier foraggregated CSI feedback; wherein the terminal further comprises: asecond receiving module, configured to receive, when the CSI-RSresources are multiple, a candidate configuration set of CSIs for CSIfeedback based on the CSI-RS resources and interference measurementresources from the base station via a second higher layer signaling,wherein the candidate configuration set indicates the one or more CSI-RSresources and interference measurement resources for measuring CSI. 15.The terminal according to claim 14, wherein the resource position wherethe DCI is located comprises time and/or frequency domain resourceposition where the DCI is configured, and there is one or more subset ofresource positions and each subset of resource positions corresponds toone of the combinations of CSI-RS resources and/or IMRs among themultiple combinations and/or IMRs.
 16. The base station according toclaim 15, wherein the second receiving module comprises: a candidatereceiving sub-module, configured to obtain the candidate configurationset of the terminal by receiving a bitmap, and each combination of thebits in the bitmap corresponds to one of multiple combinations of theCSI-RS resources and/or IMR measurement feedback mode of the CSI.